Improved bolt-headfflg machine



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gleitet) tatte attnt @fitta ROBERT GRACEY, OF PITTSBURG, -PEFNSYLYANI'A.

i Letters Patent No. 72,288, dated December 17, 1867. l

IMPROVD BOLT-HEADING MACHINE.

'ro ALL WHoM ITMAY CONGERN:

Be it known that I, ROBERT GRACEY, of Pittsburg, in thc county of Allegheny, and State oi' Pennsylvania, have invented a new and improved Machine for Making and Heading Bolts, Rivets, and Spikes; and l do hereby declare that the following isla full, clear, and exact description thereof', reference being had to the accompanying drawings, and tothe letters of reference marked thereon, in which i Figure 1 is a side elevation of the machine, some of the parts being shown in section.

Figure 2`is a plan View, the levers C', E and E being removed.

lFigure 3 is a cross-section.

Figure 4 is a face View of the stationary heading and griping-dies; an

Figure 5 is a similar view of the movable dies.

Like letters refer to the same parte in all the figures.

A is the frame, which supports the operative part of the machine. B is the main shaft, bythe rotary motion of which all the moving parts el' the'machine are operated. C is a cam on the main shaft to operate the headinglever. Ci, D, and Dare cams on the same main'shaft izo-operate the levers E and E', which move the heading and griping-dies d and 'c'. F is a toggle-joint lever, which gives motion to the heading-hammerf, being connected to lever C by a stem, F', and operated by-said lever'. Said toggle-lever F operates between a stationary head,g, and a working l1ead,-g, which carries theheading-hammer, and moves between two bars, ora,r of the frame, and under a cross-plate attached to said bars a a by means of screws. The szt'ttionary headg is confined between said bars a a by a cap-plate and a set-screw in said cap, and is adjustable, to regulatethe distance between vthe headinghammer and the heading-die, by means of atemperacrew, z'. duand CZ are the heading-dies, d being stationary,- and d" movable. c and e are the griping-dies, c being stationary, and'cmo'vable. e and c are the cutters, e being in the stationary griping-die, and e in the moving-diete eut the bolt the required length.` The length of the bolt may-be'varied by changing the griping-dies. The movable heading and griping-dies are operated by the toggle-jointlevers G and G', which are connected to the levers EfandE' by the toggle-stems The beading and griping-dies move back and forth together, except that Athe gripingdie moves forward slightly in advance of the heading-die, so that it grips the bolt-rod before the heading-dies are fairly closed upon it. The recesses in the heading-dies to grasp and enclose the bolt-rod 'are completely semicrcular, and are large enough to allow for slight variations in the size of the'iron, and yet always close together around it; but said Ilrecesses in the gripingdies areialittle less than semicircular, as shown at o, so that the dies will not quitel close around the rod, but will stand a little open when the rod is griped by them.. The object of having the griping-dies close upon thefrod, a little in advance of the heading-die, is to leave the iron free tomo-ve slightly-between the hcadingdies as the cutters sever it; and this variation inthe movement ofvthc heading and gripingdies is regulated by the adjustment of the cams D and Dl on Vthe main shaft B. `L is a lever, turning on its fulcrum Z, and held against a collar,l n, on the cam D, by a spring, 7L. This lever is actuated, suddenly, by a knocker, 7c, o'n :said collar, just as. the dies open, and throws forwarda small piston, c, worlt'- ing through one of the stationary diesto throw out the finished bolt if it should be inclined to stick. In like manner a stationary stake, s, staddled by a slot in one of the movable dies, detachee the bolt from the moving-V dies as they recede from it. The cam C is made in two sections, m and m', 'm being stationary on the shaft, v

and m removable by means of screws, so that it may be changed, and a section of different ferm 'substituted to vary the throw of the heading-hammer, and thus adjust the machine to form a head with more or 'less metal init. l) is a hollow c lindrical ost shown in section containinfr a rubber s rino' and an iron iston or4 follower, p', the head of which, covered withal-leather or Asome similar substance, receives the Weight W as the lever falls, and causes it immediately to rebound, and thus remove the hammerrfrom the hotiron the instant it has made its blow andI formed the head of the bolt; and before said weight will again descend, the cam C will have moved so far as to meet it and arrest its descent. is a rubber upon thel lever-bar C', ou which the cam C directly acts. `It projects far enough below the leve'rfbar to allow it to drop suddenly when the headinghammer makes its stroke. The weight W must be suilicie'nt to cause the heading-hammer to do its work, and maybe detached, and a heavier or lighter one may be substituted, according to the size of the bolt to beheaded.

When the dies are apart, the bolt-rod, with its extreme end heated to a welding-heat, is inserted between them, so that its heated end will come in -contact with the heading-hammer. The dies then close'upon it in the order before stated, the cutters sever it, and instantly afterwards the hammer makes its blow, forming the head. The dies then separate, and the nished bolt drops down from between them. ing docs not pass out from between the dies. length maybe headedon this machine.

It is manifest that by changing the dies, spikes and rivets may be made and headed on this machine wth out any otherlmodification. i

`The hammer in reced- By removing the cutters from the dies, bolts of' any desired It will be observed that neither the movable dies nor the headngdlammer are controlled by a positive movement, but the motion of each is determined by the mass of metal operated upon, increase in the mass of said metal will not subject the machine to any unusual strain.

Having thus fully described my machine and its mode of operation, what I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of the cam C, the weighted drop-lever C', the toggle F, and the hcadingdmmmer, structed, arranged, and operating together substantially as described.

2. The combination of the cams D and D', the levers E and E', the toggles Gr and G,

so that any accidental COH- and the movable Y heading and griping-dies, constructed, arranged,- and operating together substantially as described.

3. In combination with the heading-hammer, the toggle F, the drop-lever C', and cam C, I claim an yelastic post, stud, or other elastic bearing, to arrest the' descent oi the drop-lever, and cau and remove thehammer from the heated iron, substantially as shown and described.

4. In. combination with the beading and griping-dies, I claim the piston-7c and stake s, ating as described, to detach the finished bolt from the dies.

se it instantly' to rebound arranged and oper- Witnesses:

J. J. CooMBs, Jos. L. Coomns.

ROBERT GRACEY. 

